/Engine/Source/Runtime/UMG/Public/Blueprint/UserWidget.h
Listens for a particular Player Input Action by name. This requires that those actions are being executed, and that we're not currently in UI-Only Input Mode.
void ListenForInputAction ( [FName](API\Runtime\Core\UObject\FName) ActionName, [TEnumAsByte](API\Runtime\Core\Containers\TEnumAsByte)< EInputEvent > EventType, bool bConsume, [FOnInputAction](API\Runtime\UMG\Blueprint\FOnInputAction) Callback )